[PATCH] D64099: [InstCombine] pow(C,x) -> exp(log(C)*x)

[Dávid Bolvanský via Phabricator via llvm-commits]

xbolva00 created this revision.
xbolva00 added reviewers: spatel, efriedma.
Herald added a project: LLVM.
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Transform
pow(C,x)

To
exp(log(C)*x)

if C > 0, C != inf, C != NaN (and C is not power of 2, since we have some fold for such case already).

log(C) is folded by the compiler and exp is much faster to compute than pow.


Repository:
  rL LLVM

https://reviews.llvm.org/D64099

Files:
  lib/Transforms/Utils/SimplifyLibCalls.cpp
  test/Transforms/InstCombine/pow-exp.ll
  test/Transforms/InstCombine/pow_fp_int.ll

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